To get there, go to Main Page HL7 Wiki. You will have to log in, but you can use the following credentials for read only access:
user name: wiki
(You must create a user name and password if you want to contribute.)
Once you get there, click on the Regulated Product Submissions link in the Projects category.
There is not much in the main area, but following the RPS R2 Project link at that point will give you access to write-ups on Scope and Domain Analysis, as well as a link to business scenarios. Look for information and updates to be posted fairly often.